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Can a US Robotics USB Softmodem be made to work on Linux?

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  Can a US Robotics USB Softmodem be made to work on Linux? Jason <electron@emypeople.net> - 2017-06-15 23:10 +0200
    Re: Can a US Robotics USB Softmodem be made to work on Linux? Fungi4All <fungilife@protonmail.com> - 2017-06-15 23:40 +0200
    Re: Can a US Robotics USB Softmodem be made to work on Linux? Henrique de Moraes Holschuh <hmh@debian.org> - 2017-06-16 01:00 +0200
    Re: Can a US Robotics USB Softmodem be made to work on Linux? JPlews <jw@plews.org.uk> - 2017-06-23 19:20 +0200

#182215 — Can a US Robotics USB Softmodem be made to work on Linux?

I have a U.S. Robotics USR5639 USB modem. I am wondering how hard it
is to get it to work with Linux. Using Mint 18.1.

The modem does not show up at all in /dev when plugged in but here
is what 'lsusb' says:
Bus 001 Device 006: ID 047e:2892 Agere Systems, Inc. (Lucent) Systems Soft Modem

Is it practical to try to make this work or should I just get a 'real'
modem?

Thanks,
Jason

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#182217

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-------- Original Message --------
UTC Time: June 15, 2017 8:46 PM
From: electron@emypeople.net

I have a U.S. Robotics USR5639 USB modem. I am wondering how hard it
is to get it to work with Linux. Using Mint 18.1.
- V.92 or V.90 & V.44 ITU standard 56k
- V.34 and backwards compatible protocols
- Fax speeds up to 14,000 bit/s, Group lll, Class 1
- Data compression V.42bis and MNP 5
- Error correction V.42 LAPM and MNP 4

Here is some good bedtime reading http://www.draisberghof.de/usb_modeswitch/

The modem does not show up at all in /dev when plugged in but here
is what "lsusb" says:
Bus 001 Device 006: ID 047e:2892 Agere Systems, Inc. (Lucent) Systems Soft Modem

It is probably reading it as usb flash which may be meant for miss-windows to read the drivers
for it. You need to tell the computer that it is a modem, an analog one.

Is it practical to try to make this work or should I just get a "real"
modem?

It is the most fun you can ever have on linux ... making things work. The sad part
is that the engineers who designed it probably did it on unix/linux but were
paid to produce windows code for it. Most likely if you run something like winXP
it will recognize it and use it in minutes.

Thanks,
Jason

Good old LU went down the lu. I thought they went under but they are part
of Nokia now. It probably has some collectors' value. Please
record the handshake noise and forward it to us. I suspect you want to use it
as a fax or transmit data through some other analog medium? I would be
surprised if someone still has such a service or a BBS (remember those old farts?)

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#182218

On Thu, 15 Jun 2017, Jason wrote:
> I have a U.S. Robotics USR5639 USB modem. I am wondering how hard it
> is to get it to work with Linux. Using Mint 18.1.

...

> Bus 001 Device 006: ID 047e:2892 Agere Systems, Inc. (Lucent) Systems Soft Modem

Look for ltmodem and linmodem.  If you are very lucky, it is for that
generation of softmodems.  But last time I checked, it was for 2.6
kernels, you'd need its source, and to forward-port it.

Here's an starting point:
http://linmodems.technion.ac.il/

> Is it practical to try to make this work or should I just get a 'real'
> modem?

I'd get a real modem.

It is bad enough you'll waste a lot of CPU on crap USB-RS232 conversion,
running a full V.92 stack in kernel mode at RT priority on top is too
annoying for words.

-- 
  Henrique Holschuh

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#182555

On 15/06/17 21:46, Jason wrote:
> I have a U.S. Robotics USR5639 USB modem. I am wondering how hard it
> is to get it to work with Linux. Using Mint 18.1.
> 
> The modem does not show up at all in /dev when plugged in but here
> is what 'lsusb' says:
> Bus 001 Device 006: ID 047e:2892 Agere Systems, Inc. (Lucent) Systems Soft Modem
> 
> Is it practical to try to make this work or should I just get a 'real'
> modem?
> 
> Thanks,
> Jason
> 

Takes me back to Etch days, don't remember martian drivers ever managing 
a call, I miss BeWan PCI ADSL modems too, similar issues.

+ to just getting a serial modem, but you could try a Windows VM.

Regards

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